动载作用下水泥混凝土路面的板底脱空响应分析

发布时间：2018-03-20 21:18

  本文选题：水泥混凝土路面　切入点：脱空　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来随着公路建设的发展,我国水泥混凝土路面的公路里程逐年增加,目前在我国已建成的水泥混凝土路面中,己有部分在使用周期内就已出现各种病害。其中,水泥混凝土路面板板底脱空破坏是水泥混凝土路面的主要病害之一,并且会引起断板、错台、桥头搭板塌陷等病害。因此,对水泥混凝土路面板板底脱空及破坏机理展开深入的研究具有重要的理论意义和现实的工程价值。由于路面的不平整性,在道路上行驶的车辆会对路面产生振动荷载,并且这个荷载对路面、路基的影响与作用时间和路面的表面特性有关系,是一个典型的动态荷载。考虑到这个问题,本文在进行研究时,建立了一种具有典型代表性的水泥混凝土路面的结构模型,并通过采用有限元基本方法,结合ANSYS有限元程序分析荷载作用下水泥混凝土路面板底脱空的力学响应,得到了不同加载方式下的水泥混凝土路面结构拉应力及竖向位移的分布规律,以及荷载、车速、脱空尺寸等因素对路面的影响。本文所做的主要工作如下:⑴将板底的脱空区形状视为正方形,建立水泥混凝土路面结构三维模型,在模型上施加静荷载,通过有限元计算软件来计算出面层的最大竖向位移和板底的最大拉应力值;⑵将在平整路面上运动的荷载简化为移动恒荷载,并施加在水泥混凝土路面三维模型上,通过有限元软件进行瞬态响应分析,得到路面板的弯沉值和应力值;⑶将不平整路面上的荷载假设为移动正弦荷载,并施加在水泥混凝土路面模型上,通过有限元计算软件ANSYS进行瞬态响应分析,得到路面板的变形和受力情况;⑷分析不同工况条件下,如行车速度、车辆载重、脱空尺寸等对路面结构的动力响应规律,并将三种荷载计算结果进行对比分析.通过本文的分析,可以得出:在不平整的路面上运动的车辆荷载作用下的面层弯沉值和板底拉应力值最大,即不平整路面上的振动对路面板底脱空的损伤最大。本文对于水泥混凝土路面的结构设计和施工管理工作有一定的参考价值,其中,移动恒荷载和移动正弦荷载作用在有脱空的水泥混凝土路面上时,考虑重载交通作用的影响是本文的创新之处。
[Abstract]:In recent years, with the development of highway construction, highway mileage of cement concrete pavement in China increased year by year, at present in the cement concrete pavement have been built in China, has a part in the using period appeared various diseases. Among them, the cement concrete pavement slab void damage is one of the main diseases of the cement concrete pavement. And will cause the broken plate, fault, slab subsidence and other diseases. Therefore, it has important theoretical significance and practical for cement concrete pavement slab void and failure mechanism of in-depth study of the engineering value. Because of the uneven road, vehicles traveling on the road will produce vibration load on the pavement. And the load on the pavement, there is relationship between the surface characteristics of subgrade influence and effect of time and road, is a typical dynamic load. Considering this problem, in this research, the establishment of A typical cement concrete pavement of the structure model, and using the basic finite element method, combined with ANSYS finite element analysis of mechanical response of cement concrete pavement under load, obtained under different loading modes of cement concrete pavement structure stress distribution, stress and vertical displacement as well as the load, speed, effects of void size and other factors on the pavement. The main works are as follows: 1 will board at the end of the cavity shape as a square, the establishment of three-dimensional model of cement concrete pavement structure, a static load on the model, through the finite element software is used to calculate the maximum tension to the maximum vertical the displacement and the stress value of the bottom plate; the load moves on the rough pavement is simplified as a moving constant load, and applied in the three-dimensional model of cement concrete pavement, through the finite element software Analysis of transient response, get the pavement deflection value and stress value; the uneven loads on pavement is assumed to be sinusoidal load applied on the mobile, and the cement concrete pavement on the model for transient response analysis by finite element analysis software ANSYS, the deformation of pavement and stress; the analysis of different under different conditions, such as vehicle speed, vehicle load, the dynamic response law of void size on pavement structure, and three kinds of load calculation results were compared and analyzed. Through this analysis, we can conclude that: the value and the maximum tensile stress of slab bottom surface bending vehicle load movement in the flat surface. Under the sink, the pavement on the vibration of void damage. There is a certain reference value for the cement concrete pavement structure design and construction management of the mobile and constant load The effect of heavy load traffic is the innovation of this paper when the moving sinusoidal loading is on the cement concrete pavement with a void.

【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.216

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本文编号：1640839